[raid] `Anub'arak` bug

[mpfans]

Current Behaviour

anubarak' cast Impale ,when tracking a player, if the player gets Hand of Protection or Divine Shield and other immunity damage spells,Impale's target will become another player, and the speed will not decrease

Expected Blizzlike Behaviour

anubarak' cast Impale ,when tracking a player, if the player gets Hand of Protection or Divine Shield and other immunity damage spells,Impale's target will not changed

Source

No response

Steps to reproduce the problem

1. character paladin and character Mage enter same raid
2. Fight Anub'arak
3. Waiting for Anub'arak to drill,
4. If the Impale tracks the mage, the paladin cast Hand of Protection to the mage,Impale will change target
5. If the Impale tracks the paladin , the paladin cast Divine Shield ,Impale will change target

Extra Notes

No response

AC rev. hash/commit

https://github.com/azerothcore/azerothcore-wotlk/commit/da429f65da6d9d781d0e6bfd148bfd8a502beb98

Operating system

Ubuntu20.04

Custom changes or Modules

No response

[xclid]

https://github.com/azerothcore/azerothcore-wotlk/pull/14078

[smellbee]

actually I think this is intended，target should change，at least when I way playing in retail years ago

[xclid]

https://www.youtube.com/watch?v=N7sZ1C-1Bv4 @smellbee

[shaszun]

Aggro dropping abilities (Feign Death, Vanish, Divine Shield, Iceblock) will cause the spikes to change target, but their speed will not be reduced. Hand of protection is fine and target shouldn't be changed, this can be seen the the video @clid951 provided, which is from blizzard.

[TripsAc0912]

The target shouldn't be changed when the physical immune skill has been cast on a random player. We should fix this to normal.